Cal. Pub. Util. Code § 130051.23

Whenever the Los Angeles County Metropolitan Transportation Authority by resolution determines that any record, map, book, or paper in the possession of the authority or any officer or employee thereof is of no further value to the authority, the board may authorize its sale, destruction, or other disposition. Documents significant to the activities of the authority, including, but not limited to, board and committee agendas, incoming and outgoing correspondence, and contractual documents, shall be microfilmed or otherwise preserved prior to the sale, destruction, or other disposition of the original.